Northern Shoveler Duck (Note: This is a biological specimen, not a rock)
Spatula clypeata
not a rock (biological/ornithological)
Category
Not A Rock (Biological
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Not a rock
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Not a rock
Not a rock
Not a rock
Not a rock
Not a rock
Note: Item is not a geological specimen
Homo sapiens (Dermal Appendage: Pilus)
Organic / Biological
Ironstone Nodules (Iron Concretion)
Siderite or Hematite Concretion
sedimentary
Pink granite
Granite, chiefly quartz, potassium feldspar, and plagioclase with minor mica
igneous
Lava Rock Substrate
Scoria (Basaltic Rock)
igneous
Grass (Organic Matter/Soil)
Poaceae (family of monocotyledonous flowering plants)
Organic Materia (Not a rock or mineral)
Seashell (Calcium Carbonate)
Calcium Carbonate (CaCO3)
mineral
Chert
Silicon dioxide (SiO2)
sedimentary
Chert or Flint
Silicon dioxide (SiO2)
sedimentary
Fossiliferous Rock (Invertebrate Fossil in Matrix)
Fossiliferous limestone or shaly matrix containing skeletal fossil remains
fossil
Fossiliferous Limestone
Carbonate sedimentary rock (CaCO3)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Undetermined Due to Blur (Possible Flesh-Tone Mineral)
Unknown (Insufficient Visual Clarity)
Mineral
Sandstone with Lichen and Iron Oxide Staining
Quartz Arenite / Sandstone
sedimentary
Fossil-bearing sedimentary rock (possible bone or shell fossil)
Unidentified fossiliferous sedimentary matrix; exact fossil and host rock cannot be determined from the image
fossil
Manganese Oxide Crust on Limestone
Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3
sedimentary
Biological Bone (Patella/Knee)
Patella (part of the Human Skeletal System)
Organic Structure (Not a Rock)
Fossil Bivalve Shell
Class Bivalvia (e.g., Veneriidae family)
sedimentary
Clear gemstone earring (likely cubic zirconia)
Cubic zirconia (synthetic zirconium dioxide, ZrO₂); identification from the image is uncertain
gemstone
Fossiliferous Sedimentary Rock
Sedimentary Rock with Invertebrate Fossil Imprint
fossil
Mossy Rock
Mixed lithology rock with Bryophyta (moss)
sedimentary
Chert
Silicon dioxide (SiO2)
Sedimentary
Carved shell pendant or charm
Likely nacre (mother-of-pearl), composed chiefly of aragonite (CaCO₃) in an organic matrix
fossil
Seashell Fossil
Mollusca (Bivalvia)
fossil
Chert
Silicon dioxide (SiO2)
sedimentary
Limestone with Lichen
Carbonate Sedimentary Rock (primarily CaCO3)
sedimentary
Fossiliferous limestone, possibly a weathered shell or bone fragment
Calcite (CaCO₃) fossil material in limestone; exact fossil identification is uncertain from the image
fossil
Moss-covered Rock Fragment
Weathered Rock Fragment with Epilithic Growth
sedimentary
Chert
Silicon dioxide (SiO2)
sedimentary
Sandstone (Weathered Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone with Lichen
Arenite (SiO2 based) with biological weathering
sedimentary
Gastropod Steinkern (Internal Mold Fossil)
Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix
sedimentary
Weathered Sandstone with Algae Growth
Arenite
sedimentary
Serpentinite
Serpentinite, a rock composed mainly of serpentine-group minerals (approximately Mg₃Si₂O₅(OH)₄)
metamorphic
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Clam shell (likely a bivalve shell)
Bivalvia; shell composed primarily of calcium carbonate (usually aragonite and/or calcite)
fossil
Piddock-bored Mudstone
Lutite (Siltstone or Mudstone) with Pholad borings
sedimentary
Limpets Shell / Fossil Specimen
Patellogastropoda (Class)
fossil